Can anyone explane me why in some images I can't replace some images with bigger ones?

For example, if I replace the image of the Start Menu Search (Start Menu > Panels > Aero > Top > SearchView) with another one of 436x373 pixels, WSB gives me an error with the testing of the visual style.
I noticed the same on another part of the visual style, like the top taskbar.

Skinning windows 7 is not that good 

Composited:Bool will work in less than .1% of places to add blur.

To add the opacity back on max windows change the value of ColorizationColor:Int in Windows and Caption Buttons > Aero > Dwm Window > Frames > Normal > Top > MaxActive to -16777216

Thank you very much, the opacity thing works for me..
Is it also possible to add it to the taskbar when maximized?
I searched but I didn't find anything for that and I don't think it's possible anymore..

About the Compisited:Bool it don't works for that.. but that's not a problem, I can live without it
Thanks again.

I all!
I'm new to the site and I found it really interesting, many thanks for this
I went here to have some help and opinions from you, and I also hope to be helpfully for you.

Now I was thinking about that...
Is it possible to add the Blur to a section with a property?
For instance if I want to add the blur to a part of the visual style that does not have it, can it be done?


Another quick question, is it possible to put the opacity on max like vista?
Editing DWM Windows> Frames> doesn't work..

Many thanks..hope to have an answer, and keep it up